Strainer for wells



A. VULTORIUS Feb. 2L, i939 STRAINER FOR WELLS Filed Dec, 10, 1937 "INVENZOR: Wiforzas Patented Feb. 21, 1939 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to a new strainer to be placed at the lower end of a depth pipe or to simply constitute that lower portion of the pipe or even to represent the pipe proper.

One feature of the invention resides in the fact that the filtering means is formed by a plurality of slats making up a Venetian blind and being separated from one another by portions devoid of this particular shape of section.

Another feature of this invention resides in the fact that the sucked up water is allowed only to pass through the space or clearance existing between the inside edge of the slit and the face adjacent to said edge. This clearance is small enough to prevent the passage of the sand drawn up by the pump together with the water.

Other characteristics of this invention will be apparent from the drawing attached hereto wherein an embodiment of the invention is shown by way of example. In this drawing:

Fig. 1 is a longitudinal section of the Venetian blind serving as a filter and the angular slats of which are duly shown,

Fig. 2 is a front view of a portion of the Vene- 25 tian blind, clearly showing its water inlet provided between one slat and the other,

Fig. 3 is a cross section of a detail of the slats of the blind showing the position of the slit which while permitting the passage of water prevents that of sand, and

Fig. 4 is a perspective view of a portion of the Venetian blind.

In the course of the following description successive numerals will be used to indicate the vari- 35 ous parts that are being mentioned, it being understood that the same numerals even when used in different figures serve to indicate the same parts.

On a preferably curved metal sheet I forming 40 a round pipe a plurality of horizontal cuts 2 are formed in longitudinal rows, the latter being separated from one another by a blank having no cuts, as at 3.

At the ends of the cuts 2 that extend circum- 45 ferentially of the pipe I there are formed the cuts 4 being vertical to the former.

The presence of these cuts 4 makes it possible for the slat 5 formed between the horizontal cuts 2 to be lifted and bent to an obtuse angle.

In this manner there is left between the upper face 6 of the slat 5 and the edge 1 of the one immediately above a clearance 8 through which the water is sucked up.

This Venetian blind may be formed at the end of a pipe or formed on a separate pipe and then secured to the end of the suction pipe; also a simple fitting may be used.

The width of the clearance is dependent on the kind of underground water the pump is to work on. Therefore, a sample of the sand is taken and the minimum thickness thereof is determined.

It may be stated that while the suction proceeds the water draws up sand taking it to the clearance 8 where it would accumulate, if its proper weight would not cause it to fall, back through the suction spaces.

To utilize the filter it is necessary to first make a perforation and then to introduce the depth pipe the end of which constitutes the filtering means to be used, in this case the Venetian blind.

Stress is laid on the fact that what has been described is only a practical embodiment of the basic idea so that the same may be varied within the bearing of the fundamental characteristics which are properly ascertained and determined in the appended claim.

What I claim is:

A well strainer comprising, a pipe having longitudinal rows of circumferentially extending slats formed from out portions of the pipe, each slat being bent so that the top portion thereof extends angularly with respect to the axis of the pipe at a given angle upwardly and towards the interior of the pipe, the lower portion of each slat extending angularly at a smaller angle than the angular relation of the upper portion with respect to the axis of the pipe, and said lower portion projecting downwardly and outwardly of the pipe, the upper and lower portions of said slats when viewed in section having straight faced surfaces merging with each other and the lower portion of each slat being terminated so that the inner lower corner lies adjacent the outer face of the upper portion of the next slat thereof.

ALFREDO VULTORIUS. 

